My answer is..It depends!! I always pack the appropriate attire to attend formal nights..and always go to at least one of them. However, I have been on a 7 night cruise and skipped one of the formal nights as I was in the mood to go to one of them, but not in the mood to go to the second. Some of my decision is based on menu, some of it is based on how long my day was in port and how tired I am!!
I loved to get dressed up and feel oh so feminine. Hence, I have to go at least once. I love the old fashioned feeling formal nights lend. I guess in the end..I'm FOR formal nights.